He Da, Gao Yu, Wang Zhipeng, Yao Yucen, Wu Ling, Zhang Jiang, Huang Zheng-Hong, Wang Ming-Xi
Key Laboratory for Green Chemical Process of Ministry of Education, School of Chemical and Environmental Engineering, Wuhan Institute of Technology, Wuhan 430205, China.
Institute of Advanced Materials, Jiangxi Normal University, Nanchang 330022, China.
J Colloid Interface Sci. 2021 Jan 1;581(Pt A):238-250. doi: 10.1016/j.jcis.2020.07.118. Epub 2020 Jul 27.
Hierarchical porous hollow carbon nanospheres (HCNSs) were fabricated directly from raw biomass via a one-step method, in which HCNSs were obtained by thermal treatment of raw biomass in the presence of polytetrafluoroethylene (PTFE). The HCNSs possess coupling merits of uniformly distributed hollow spherical architectures, and high specific surface area, abundant accessible/open micropores and reasonable mesopores, the HCNS-based electrodes deliver high electrochemical capacitance. The formation mechanisms of pores and hollow core-shell structures were explored thoroughly, it is found that the key to the formation of hollow core-shell structure is the onset-pyrolysis temperature difference between raw biomass and PTFE. Moreover, the content of silica had significant effects on the textures of HCNSs, and HCNS with the largest SSA of 1984 m/g was obtained. Accordingly, a possible mechanism of HCNSs formation was proposed here, where PTFE acted as the pore creation and nucleation agents and raw biomasses were the primary carbon precursors.
通过一步法直接从原始生物质制备了分级多孔空心碳纳米球（HCNSs），其中HCNSs是在聚四氟乙烯（PTFE）存在下对原始生物质进行热处理而获得的。HCNSs具有均匀分布的空心球形结构、高比表面积、丰富的可及/开放微孔和合理的中孔等耦合优点，基于HCNSs的电极具有高电化学电容。对孔和空心核壳结构的形成机制进行了深入探索，发现空心核壳结构形成的关键是原始生物质和PTFE之间的起始热解温度差。此外，二氧化硅的含量对HCNSs的织构有显著影响，获得了比表面积最大为1984 m²/g的HCNSs。因此，在此提出了一种可能的HCNSs形成机制，其中PTFE充当造孔和成核剂，原始生物质是主要的碳前驱体。
